set(VPP_LOG2_CACHE_LINE_SIZE ${VPP_LOG2_CACHE_LINE_SIZE}
CACHE STRING "Target CPU cache line size (power of 2)")
+##############################################################################
+# Gnu Assembler AVX-512 bug detection
+# - see: https://sourceware.org/bugzilla/show_bug.cgi?id=23465
+##############################################################################
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
+ if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
+ set(pfx ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/gas_avx512_bug_test)
+ file(WRITE ${pfx}.s "vmovaps 0x40(,%rax), %zmm0\n")
+ execute_process(COMMAND ${CMAKE_C_COMPILER} -c ${pfx}.s -o ${pfx}.o)
+ execute_process(COMMAND objdump -s ${pfx}.o OUTPUT_VARIABLE _output)
+ if (NOT _output MATCHES "62f17c48 28040540 000000")
+ set(GNU_ASSEMBLER_AVX512_BUG 1)
+ endif()
+ endif()
+endif()
+
##############################################################################
# CPU optimizations and multiarch support
##############################################################################
if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
set(CMAKE_C_FLAGS "-march=corei7 -mtune=corei7-avx ${CMAKE_C_FLAGS}")
- check_c_compiler_flag("-march=core-avx2" compiler_flag_march_core_avx2)
- if(compiler_flag_march_core_avx2)
- list(APPEND MARCH_VARIANTS "avx2\;-march=core-avx2 -mtune=core-avx2")
+ check_c_compiler_flag("-march=haswell" compiler_flag_march_haswell)
+ if(compiler_flag_march_haswell)
+ list(APPEND MARCH_VARIANTS "hsw\;-march=haswell -mtune=haswell")
endif()
- check_c_compiler_flag("-march=skylake-avx512" compiler_flag_march_skylake_avx512)
- if(compiler_flag_march_skylake_avx512)
- list(APPEND MARCH_VARIANTS "avx512\;-march=skylake-avx512 -mtune=skylake-avx512")
+ if (GNU_ASSEMBLER_AVX512_BUG)
+ message(WARNING "AVX-512 multiarch variant(s) disabled due to GNU Assembler bug")
+ else()
+ check_c_compiler_flag("-mprefer-vector-width=256" compiler_flag_mprefer_vector_width)
+ check_c_compiler_flag("-march=skylake-avx512" compiler_flag_march_skylake_avx512)
+ check_c_compiler_flag("-march=icelake-client" compiler_flag_march_icelake_client)
+ if(compiler_flag_march_skylake_avx512 AND compiler_flag_mprefer_vector_width)
+ list(APPEND MARCH_VARIANTS "skx\;-march=skylake-avx512 -mtune=skylake-avx512 -mprefer-vector-width=256")
+ endif()
+ if(compiler_flag_march_icelake_client AND compiler_flag_mprefer_vector_width)
+ list(APPEND MARCH_VARIANTS "icl\;-march=icelake-client -mtune=icelake-client -mprefer-vector-width=512")
+ endif()
endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
set(CMAKE_C_FLAGS "-march=armv8-a+crc ${CMAKE_C_FLAGS}")
endif()
check_c_compiler_flag("-march=armv8.1-a+crc+crypto -mtune=thunderx2t99" compiler_flag_march_thunderx2t99)
if(compiler_flag_march_thunderx2t99)
- if (CMAKE_C_COMPILER_VERSION VERSION_GREATER 7.3)
+ if (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.3))
list(APPEND MARCH_VARIANTS "thunderx2t99\;-march=armv8.1-a+crc+crypto -mtune=thunderx2t99 -DCLIB_N_PREFETCHES=8")
else()
list(APPEND MARCH_VARIANTS "thunderx2t99\;-march=armv8.1-a+crc+crypto -DCLIB_N_PREFETCHES=8")
if(compiler_flag_march_cortexa72)
list(APPEND MARCH_VARIANTS "cortexa72\;-march=armv8-a+crc+crypto -mtune=cortex-a72 -DCLIB_N_PREFETCHES=6")
endif()
+ check_c_compiler_flag("-march=armv8.2-a+crc+crypto -mtune=neoverse-n1" compiler_flag_march_neoversen1)
+ if(compiler_flag_march_neoversen1)
+ list(APPEND MARCH_VARIANTS "neoversen1\;-march=armv8.2-a+crc+crypto -mtune=neoverse-n1 -DCLIB_N_PREFETCHES=6")
+ endif()
endif()
macro(vpp_library_set_multiarch_sources lib)
set(l ${lib}_${VARIANT})
add_library(${l} OBJECT ${ARGN})
set_target_properties(${l} PROPERTIES POSITION_INDEPENDENT_CODE ON)
- target_compile_options(${l} PUBLIC "-DCLIB_MARCH_VARIANT=${VARIANT}" -Wall -fno-common)
+ target_compile_options(${l} PUBLIC "-DCLIB_MARCH_VARIANT=${VARIANT}")
separate_arguments(VARIANT_FLAGS)
target_compile_options(${l} PUBLIC ${VARIANT_FLAGS})
target_sources(${lib} PRIVATE $<TARGET_OBJECTS:${l}>)